Luiken did not specify a reason for his resignation, which is effective Oct. 1. He was traveling Thursday and didn’t immediately return a message.

He noted in the letter that his personal commitment “has been to loyally serve and support” Parnell as a friend and governor.

But Luiken notes that they always didn’t agree on the methods.

Parnell’s spokeswoman, Sharon Leighow, did not respond when asked in an email if the governor sought Luiken’s resignation. However, she said Luiken is a “hard-working man of integrity and we wish him well in his future endeavors.”